Order Ostreida Fërussac 1822 (clam)
Alternative spelling: Ostreoida
Parent taxon: Ostreiformii according to J. G. Carter et al. 2011
Sister taxon: Pectinida
Subtaxa: Enantiostreon, Harpax, Malleidina, Ostreidina, Pectinina
Ecology: stationary epifaunal suspension feeder